Custom error pages in Rails3.2

gistfile1.rb

# In rails 3.2, it's creating custom error pages is much more easier:
#
# Add this to config/application.rb:

  config.exceptions_app = self.routes

# That causes errors to be routed via the router. Then you just add to config/routes.rb:

  match "/404", :to => "errors#not_found"

# Now create your ErrorsController#not_found 
# You can always access the original exception in the controller at env["action_dispatch.exception"];
# You won’t be able to see your custom exceptions in development unless you set config.consider_all_requests_local to false in your config/environments/development.rb.